The impact of the complex evaporites features’ on the seismic illumination of the underlying rocks: A case study in the Brazilian presalt

Zambrini, João Paulo Rodrigues; Lupinacci, Wagner Moreira; Gambôa, Luiz Antônio Pierantoni; Neves, Igor A.; Cherene, Rafael; Azul, Maria Olho

doi:10.1016/j.petrol.2020.107177

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…The pre-salt region in Brazil is recognized as the biggest set of recently discovered giant oil fields in the world [3]. However, more than ten years after its discovery, operations in the pre-salt carbonates continue to present challenges in terms of drilling, production, and also in relation to the reservoir characterization [4,5]. Pre-salt carbonate reservoirs are highly complex and heterogeneous [2,6,7], a feature justified by the nature of the original deposition system and the subsequent diagenetic processes [2].…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Multi-Objective Optimization of the Rate of Penetration and Mechanical Specific Energy: A Case Study Applied to a Carbonate Hard Rock Reservoir Based on a Drill Rate Test Using Play-Back Methodology

Mantegazini,

Nascimento,

Dornelas

et al. 2024

Applied Sciences

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Until early 2006, in Brazil, the focus used to be on oil and gas exploration/exploitation of post-salt carbonates. This changed when the industry announced the existence of large fields in pre-salt layers across the South Atlantic Ocean from nearshore zones up to almost 350 [km] from the shore. With the discovery of pre-salt hydrocarbons reservoirs, new challenges appeared. One of the main challenges is the necessity to optimize the drilling processes due to their high operational costs. Drilling costs are considerably high, which leads the oil and gas industry to search for innovative and entrepreneurial methods. The coupling of the mechanical specific energy (MSE) and the rate of penetration (ROP) is a method that allows for the identification of ideal conditions to efficiently enhance the drilling process. In addition, the performance of the drilling process can be estimated through pre-operational tests, which consist in continuously testing the applied drilling mechanic parameters, such as the weight-on-bit (WOB) and drill string rotary speed (RPM), looking for optimum sets that would ultimately provide the most desirable ROP. Thus, the goal of this research was to analyze field data from pre-salt layer operations, using a multi-objective optimization based on the play-back methodology for pre-operational drilling tests, through the ideal combination of the highest ROP and the lowest MSE. The results showed that the new concept of pre-operational tests based on the MSE proved to be effective in the drilling process optimization. The combination of the highest ROP and the lowest MSE allows for a high-performance drilling process. For WOB intervals of 5 and 7 [klb], a good fit of the parameters was obtained. Through the parameters obtained from pre-operational tests, the eventual cost-saving and time-saving values could be estimated, respectively, ranging from USD 1,056,180 to 1,151,898 and 19.50 to 21.27 [h], respectively. In addition, the results of this research can be applied to the exploration of other natural resources, such as natural hydrogen and geothermal sources.

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Section: Introductionmentioning

confidence: 99%

“…In the sequence, the optimization of the responses can be performed using the global function, as represented by Equation (5).…”

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confidence: 99%

Analysis and Multi-Objective Optimization of the Rate of Penetration and Mechanical Specific Energy: A Case Study Applied to a Carbonate Hard Rock Reservoir Based on a Drill Rate Test Using Play-Back Methodology

Mantegazini,

Nascimento,

Dornelas

et al. 2024

Applied Sciences

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“…Salt basins, like the Gulf of Mexico and Angola, are one of most prospective places for oil and gas exploration (Leveille et al ., 2011). Seismic illumination is one key issue for subsurface imaging (Kim et al ., 2018) and reservoir characterization (Zambrini et al ., 2020), but the subsalt targets usually suffer from the problem of poor illumination (Liu et al ., 2011; Um et al ., 2014). The oil and gas industry has made great strides over the past two decades, but some fundamental challenges – such as imaging of poorly illuminated subsalt structures and complex salt interpretation – have not been entirely overcome (Etgen et al ., 2016).…”

Section: Introductionmentioning

confidence: 99%

An illumination‐compensated Gaussian beam migration for enhancing subsalt imaging

Liu

Yan

Zhu

et al. 2021

Geophysical Prospecting

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Seismic images of Earth's subsurface are essential for oil and gas exploration. Gaussian beam migration is popular for seismic imaging owing to its flexibility and efficiency of implementation. However, the practical use of classic Gaussian beam migration is limited for complicated structures such as subsalt because of poor seismic illumination in those areas. We propose an illumination‐compensated Gaussian beam migration under the framework of least‐squares migration, enhancing the subsalt imaging effectively. A novel scheme based on the Born modelling and migration of Gaussian beam is developed to estimate the point spreading function, with which the illumination compensation can be efficiently implemented in the local wavenumber domain. As the aim of least‐squares migration, the proposed illumination‐compensated Gaussian beam migration produces true‐amplitude images in subsalt areas, which facilitates the seismic interpretation of subsalt structures. The total computational cost of the proposed method includes one Born modelling process and two conventional Gaussian beam migrations, and thus it is much more efficient than the classic least‐squares migration which requires multiple iterations. Numerical examples have demonstrated the effectiveness of the adaptive strategies, manifesting applicable potential in oil and gas exploration of subsalt targets.

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Probabilistic Estimation of Seismically Thin-Layer Thicknesses with Application to Evaporite Formations

2022

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The impact of the complex evaporites features’ on the seismic illumination of the underlying rocks: A case study in the Brazilian presalt

Cited by 3 publications

References 4 publications

Analysis and Multi-Objective Optimization of the Rate of Penetration and Mechanical Specific Energy: A Case Study Applied to a Carbonate Hard Rock Reservoir Based on a Drill Rate Test Using Play-Back Methodology

Analysis and Multi-Objective Optimization of the Rate of Penetration and Mechanical Specific Energy: A Case Study Applied to a Carbonate Hard Rock Reservoir Based on a Drill Rate Test Using Play-Back Methodology

An illumination‐compensated Gaussian beam migration for enhancing subsalt imaging

Probabilistic Estimation of Seismically Thin-Layer Thicknesses with Application to Evaporite Formations

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